.\" Copyright (c) 2011 Kai Wang
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.\" $Id: dwarf_add_fde_inst.3 3961 2022-03-12 15:13:22Z jkoshy $
.\"
.Dd September 26, 2011
.Dt DWARF_ADD_FDE_INST 3
.Os
.Sh NAME
.Nm dwarf_add_fde_inst
.Nd add a call frame instruction to a DWARF frame descriptor
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft "Dwarf_P_Fde"
.Fo dwarf_add_fde_inst
.Fa "Dwarf_P_Fde fde"
.Fa "Dwarf_Small op"
.Fa "Dwarf_Unsigned val1"
.Fa "Dwarf_Unsigned val2"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_add_fde_inst
adds a call frame instruction to the DWARF frame descriptor
referenced by argument
.Fa fde .
.Pp
Argument
.Fa fde
should reference a frame descriptor allocated using
.Xr dwarf_new_fde 3 .
.Pp
Argument
.Fa op
specifies the operator for the frame instruction.
The DWARF standard defines the set of legal values for this argument.
.Pp
Argument
.Fa val1
specifies the first operand of the frame instruction.
.Pp
Argument
.Fa val2
specifies the second operand of the frame instruction.
.Pp
If argument
.Fa err
is not
.Dv NULL ,
it will be used to store error information in case of an error.
.Sh RETURN VALUES
On success, function
.Fn dwarf_add_fde_inst
returns the frame descriptor given in argument
.Fa fde .
In case of an error, function
.Fn dwarf_add_fde_inst
returns
.Dv DW_DLV_BADADDR
and sets the argument
.Fa err .
.Sh ERRORS
Function
.Fn dwarf_add_fde_inst
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_FRAME_INSTR_EXEC_ERROR"
.It Bq Er DW_DLE_ARGUMENT
Argument
.Fa fde
was
.Dv NULL .
.It Bq Er DW_DLE_FRAME_INSTR_EXEC_ERROR
The frame instruction operator specified in argument
.Fa op
was invalid.
.It Bq Er DW_DLE_MEMORY
An out of memory condition was encountered during the execution of the
function.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_add_frame_cie 3 ,
.Xr dwarf_add_frame_fde 3 ,
.Xr dwarf_add_frame_fde_b 3 ,
.Xr dwarf_fde_cfa_offset 3 ,
.Xr dwarf_new_fde 3
.Rs
.%T "The DWARF Debugging Information Format"
.%V "Version 4"
.%O "http://www.dwarfstd.org/"
.Re
